Brevity is the Soul of Wit
Heebie-Geebie offers some sage advice on story-telling and blogging:
First, cut way more details than you want to. Cut almost everything. Cut so much that you’re staying ahead of the person listening. Only fill in extra details if they’re still fascinated and you’re going back to flesh out the situation. Second, if your audience isn’t quite captivated, don’t hang on to the point. Blurt it out right at the beginning. If they’re still not captivated, give up. If they do become interested, then fill in the details.
Blogging is very similar. It’s not about the content of the post, but about not bogging down in boring details.
I was at a blogging seminar with Matt Yglesias a while back and he said the key was to have one idea — and only one idea — per post. I violate that rule more often than I should.